Package the box

You may not want to include the Vagrantfile and/or private key in
the box. If you do include the private key, be careful with file
permissions -- maybe set a umask.

Sharing the base box

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If you plan to share the base box with others, you should use a
dummy password and create a dummy ssh keypair when creating the base
box; share the dummy keypair and password along with the base box.

Before anyone (including you) uses the base box, they should change
the password and create a new keypair for themselves, then add it to
~/.ssh/authorized_keys for the ubuntu and vagrant users, replacing
the dummy key.